icu_locale_core 2.3.0: icu_locale_core::Locale

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify icu_locale_core::Locale in pkg:cargo/icu_locale_core@2.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/icu_locale_core@2.3.0
Demonstrate these symbols/APIs:
  - icu_locale_core::Locale

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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  "schemaVersion": 1,
  "goal": "verify icu_locale_core::Locale in pkg:cargo/icu_locale_core@2.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/icu_locale_core@2.3.0"
  ],
  "symbols": [
    "icu_locale_core::Locale"
  ]
}

//! Clean-room verification sample for icu_locale_core Locale.

pub use icu_locale_core::*;

use core::cmp::Ordering;
use icu_locale_core::{
    extensions::unicode::{key, value},
    locale,
    subtags::{language, region, script},
    LanguageIdentifier, Locale, ParseError,
};

fn main() {
    // 1. locale macro constructs Locale at compile time for valid BCP-47 tags
    let loc: Locale = locale!("en-US-u-ca-buddhist");
    assert_eq!(loc.id.language, language!("en"));
    assert_eq!(loc.id.script, None);
    assert_eq!(loc.id.region, Some(region!("US")));
    assert_eq!(
        loc.extensions.unicode.keywords.get(&key!("ca")),
        Some(&value!("buddhist"))
    );

    const UNKNOWN_LOC: Locale = Locale::UNKNOWN;
    assert_eq!(UNKNOWN_LOC, locale!("und"));
    assert!(UNKNOWN_LOC.extensions.is_empty());

    // 2. Locale parses valid language tags with unicode extensions and subtags using try_from_str
    let parsed = Locale::try_from_str("zh-Hans-CN-u-nu-thai");
    assert!(parsed.is_ok());
    let parsed_loc = parsed.unwrap();
    assert_eq!(parsed_loc.id.language, language!("zh"));
    assert_eq!(parsed_loc.id.script, Some(script!("Hans")));
    assert_eq!(parsed_loc.id.region, Some(region!("CN")));
    assert_eq!(
        parsed_loc.extensions.unicode.keywords.get(&key!("nu")),
        Some(&value!("thai"))
    );

    let from_bytes = Locale::try_from_utf8(b"fr-CA");
    assert!(from_bytes.is_ok());
    assert_eq!(from_bytes.unwrap().to_string(), "fr-CA");

    // 3. Locale rejects invalid language tags and duplicated extensions returning ParseError
    let invalid_lang = Locale::try_from_str("toolonglanguage");
    assert_eq!(invalid_lang, Err(ParseError::InvalidLanguage));

    let invalid_subtag = Locale::try_from_str("en-??");
    assert_eq!(invalid_subtag, Err(ParseError::InvalidSubtag));

    let dup_ext = Locale::try_from_str("und-u-hc-h12-u-ca-calendar");
    assert_eq!(dup_ext, Err(ParseError::DuplicatedExtension));

    // 4. Locale normalizes casing across language, script, region and extension subtags
    let normalized = Locale::normalize("pL-lAtN-pL-U-HC-H12");
    assert!(normalized.is_ok());
    assert_eq!(normalized.unwrap(), "pl-Latn-PL-u-hc-h12");

    let mixed = Locale::try_from_str("EN-latn-US-u-CA-BUDDHIST").expect("valid");
    assert_eq!(mixed.to_string(), "en-Latn-US-u-ca-buddhist");

    // 5. Locale supports normalizing equality, strict byte comparison, and total struct ordering
    assert!(loc.normalizing_eq("EN-us-U-ca-BUDDHIST"));
    assert!(!loc.normalizing_eq("en-GB"));

    let en_us = locale!("en-US");
    assert_eq!(en_us.strict_cmp(b"en-US"), Ordering::Equal);
    assert_eq!(en_us.strict_cmp(b"ar-SA"), Ordering::Greater);
    assert_eq!(en_us.strict_cmp(b"zh-TW"), Ordering::Less);

    let mut list = vec![
        locale!("zh-TW"),
        locale!("ar-SA"),
        locale!("en-US"),
    ];
    list.sort_by(Locale::total_cmp);
    assert_eq!(list[0], locale!("ar-SA"));
    assert_eq!(list[1], locale!("en-US"));
    assert_eq!(list[2], locale!("zh-TW"));

    // 6. Locale converts to and from LanguageIdentifier preserving base language tags
    let lang_id: LanguageIdentifier = loc.clone().into();
    assert_eq!(lang_id.language, language!("en"));
    assert_eq!(lang_id.region, Some(region!("US")));

    let loc_from_lid: Locale = lang_id.into();
    assert_eq!(loc_from_lid, locale!("en-US"));

    println!("All icu_locale_core::Locale contract assertions passed successfully.");
}